Combined heel, forepart and cement-lasting machine

ABSTRACT

A combined heel, forepart and cement-lasting machine having a heel-band supported in the machine frame and a last-carrier displaceable by means of a motor in a direction towards the heelband. The motor is a rotary motor which engages the last-carrier by way of a self-locking spindle drive to provide a precise position thereof during the working cycle.

United States Patent Schindler et al. [451 Apr. 11, 1972 [54] COMBINED HEEL, FOREPART AND CEMENT-LASTING MACHINE 1 R r n Cited [72] Inventors: Herbert Schindler, Pirmasens; Gerhard UNITED STATES PATENTS Havenstem bmh Germany 1,368,968 2/1921 Pym ..12/12.5 [73] Assignee: Firma Schon & Cie. Gesellschaft mit 3,409,921 11/1968 Stein et a1. ..12/ 12.5

beschrankter Haftung, Pirmasens, Germany Primary Exarniner-Patrick D. Lawson Filed: y 1970 Attorney-Fncdman & Goodman [21] Appl. No.1 59,633 ABSTRACT A combined heel, forepart and cement-lasting machine having 30 Foreign A li ti i i Data 21 heel-band supported in the machine frame and a last-carrier displaceable by means of a motor in a direction towards the 5, 1969 Germany 19 39 747-8 heel-band. The motor is a rotary motor which engages the lastcarrier by way of a self-locking spindle drive to provide a U.S. ..l2/l2.5, precise position thereof during the working cycle [51] Int. Cl ..A43d 21/00, A43d 3/00 [58] Field of Search l2/l2.5, 10.5, 12.4, 126, 127 10 Claims, 4 Drawing Figures PATENTEDAPR 11 I972 3, 654. 6551 saw 1 BF 3 llll IIOul INVENTORS IlvrIn-ri Schindler 1s (ivrhurrlt Win11:-

PATENTEBAPR 1 1 I972 SHEET 2 OF 3 INVENTORS PATENTEDAPR 11 I972 8,654, 651

SHEET 3 [IF 3 III k INVENTORS COMBINED HEEL, FOREPART AND CEMENT-LASTING MACHINE BACKGROUND OF THE INVENTION This invention relates to a combined heel, forepart and cement-lasting machine with a heel-shaping band supported in the machine frame, and a last-carrier displaceable by means of a motor in a direction towards the heel-band. In heel cementlasting machines equipped with an overlap device the upper leather within the heel portion is tucked-in, secured and the wrap-over cemented by means of a fusion adhesive. The last thimbles by means of which a last is secured in a last-carrier exhibit a spacing difference of up to millimeters between the end of a last and the center of the thimble when comparing the entire last series-from the smallest to the largest. These distance variations have an undesirable effect on the working cycle. They also result in a non-uniform lasting wrap-in edges. In order to eliminate this shortcoming it was suggested that an adjustable boss be provided in the machine frame, against which the last would come to rest; this contact between the boss and the last would serve to switch off the motor which advances the last-carrier. As a result, the last-carrier with the last accommodated thereon would come to rest in precisely the correct position with respect to the applicator head of the cement applicator device.

However, such an arrangement still fails to give a positive assurance that the last-carrier, together with the last accommodated thereon, will always remain in this position during the working cycle. It can be easily, if unintentionally, shifted from this precise position by forces resulting from the working cycle, which act thereon in transverse direction. A special locking device could be provided to avoid such displacement.

SUMMARY OF THE INVENTION In accordance with the principle of this invention, it is suggested to make the motor a rotary motor which engages the last-carrier by way of a self-locking spindle drive. The selflocking spindle forms a dependable locking device; moreover, it has an additional advantage in that it engages at the precise moment at which the boss actuates the disengage switch for the motor, so that it not only locks the last-carrier in the desired position but also precisely defines this position. A further advantage of the arrangement based upon this invention is to be seen in the fact that no separate locking means are required since the spindle takes over the locking function in addition to serving as drive means.

In one embodiment of the invention the spindle is driven by a hydraulic motor known in the art. Compared with the use of a hydraulic motor of the reciprocating type featuring a piston rod, the arrangement suggested by the present invention and employing a spindle driven by a rotary-type hydraulic motor represents an improvement inasmuch as it entirely eliminates the above-mentioned displacement as well as play resulting from yielding under pressure.

In accordance with the principle of this invention, it is of advantage that the last-carrier be pivotably supported in the machine frame.

The disposition of the arrangement based upon this invention is preferably such that the centers of the motor shaft and the spindle are substantially aligned and co-planar with the center of the last-carrier. Such a configuration tends to improve the stability of the working position of the last-carrier.

Furthermore, the cut-out means are associated with the spindle-driving motor, and a tripping blade is provided between the heel-band and the last to actuate the motor cutout means. Both the tripping blade and the cut-out means are adjustably accommodated on the heel-band carrier.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described and explained in greater detail with the aid of a preferred embodiment shown in the appended drawing in which:

FIG. 1 is a side-view of the arrangement based upon this invention, in section, details being left out for the sake of clarity;

FIG. 2 shows a portion of FIG. 1, in section; FIG. 3 shows the same portion, in front view, and FIG. 4 shows another portion of F IG. 1.

DESCRIPTION OF THE PREFERRED EMBODIMENT The hydraulic motor 1 is actuated by way of electro-hydraulic servo-control means (not shown), whereupon it moves the last-carrier 5 by way of a spindle 2, a nut 3 and a rod 4, causing the last-carrier to pivot around a joint 25 so that it moves out of its initial position 5: shown in dashed line (FIG. 1) into its operating position indicated by a solid line. This movement takes place in a direction towards a cutter head 6 (FIG. 2), where the last 7 comes into contact with the tripping blade 8 with its heel portion and so displaces the blade that the latter actuates an electric switch 11 by way of a lever 9 and a setscrew 10. In response, the switch 11 cuts out the hydraulic motor 1 with the aid of an electro-hydraulic servo-control means (not shown) and thus arrests the advance of the lastcarrier. The pressure then exerted by the cutter l2 and the heel-band 13 against the last is absorbed by the spindle 2, which locks the last-carrier 5 in its operating position.

The carriage 16 with devices 8, 9, 10 and 11 mounted thereon can be horizontally displaced by means of a set-screw 14 and a compression spring 15. It is thus possible to adjust the position of the last 7 with respect to the edge of the cutter 12. When the last-carrier has reached its operating position, the heel-band 13 is moved in a direction towards the last 7.

After the termination of the working cycles, the machine is returned into its initial position 5: either by means of a time relay or by a foot-actuated switch; a limit switch (not shown) defines the initial position.

Details of the cement applicator device have been omitted.

Since the operating position of the last-carrier 5 is adjustable in response to last measurements, as determined by the tripping blade 8, while the position of the cement applicator device in the machine is fixed, all the operating devices are in correct positions with respect to the last at the start of the working cycle, and to the respective part of the shoe carried by the last.

The arrangement based upon this invention is shown in detail in FIG. 4. Reference numeral 1 identifies the hydraulic motor which on its front part carries a casing 21 into which extends its shaft 22 and which also supports spindle 2. The hydraulic motor 1 with a joint 24 is supported on a bracket 23. A further joint 26 is shared by the last-holder 5 and a bracket 4 for the spindle nut 3. Depending on the position of the lastcarrier, the motor 1 and the spindle 2 adjust their position with the aid of spindle nut 3 and its bracket 4.

The extremity of the motor shaft 22 and that end 28 of the spindle 2, which faces the motor are journalled together in a thrust bearing 27. An adjustment therefor is provided by locknuts 29 on the thread present at the spindle end 28, while bracing is provided by head 30 at the other spindle end. The lock-nuts 29 also serve to adjust the two roller bearings 31 and 32 by means of which the spindle 2 is journalled in casing 21. The drive includes a spline 33 on the shaft 22.

To prepare the machine for its working cycle, the motor 1 moves the last-carrier 5 by pivoting it around joint 25 in a counter-clock movement by means of the spindle 2 via the bracket 4 of the spindle nut 3. When the last 7, together with the upper leather accommodated thereon, is mounted on the last-carrier 5, the motor is actuated to move the last-carrier 5 and set it up in clockwise direction by means of the bracket 4 of the spindle nut 3. At the moment the tripping blade 8 comes into contact with the last 7 the motor 1 is cut out and the lastcarrier 5 is locked in this position by the self-locking property of the spindle drive 2, 3. Even if, for one reason or other, strong pressure exerted against the last-carrier 5 is transferred to the bracket 4 together with nut 3 and to the spindle 2 and then to the motor 1, none of the drive-train elements would yield to bring the last-carrier 5 out of alignment. As a result, the last-carrier 5 remains in its precisely defined working position at all times during the working cycle.

Numerous alterations of the structure herein disclosed will suggest themselves to those skilled in the art. However, it is to be understood that the present disclosure relates to a preferred embodiment of the invention which is for purposes of illustration only, and not to be construed as a limitation of 5 the invention.

What is claimed is:

l. A combined heel, forepart and cement-lasting machine comprising a machine frame, a heel-band supported in said machine frame, a last-carrier, motor means for displacing said last-carrier towards said heel-band, said motor means including a rotary motor, and self-locking spindle drive means coacting with said rotary motor for both moving and stopping said last-carrier to provide a precise position thereof during a working cycle, said self-locking spindle drive means including threaded members operatively associated with one another for both moving said last-carrier when said rotary motor is operating and locking said last-carrier against movement when operation of said motor is terminated.

2. A combined heel, forepart and cement-lasting machine according to claim 1, wherein said rotary motor drives a spindle of said spindle drive means, said rotary motor being a hydraulic motor.

3. A combined heel, forepart and cement-lasting machine according to claim 2, wherein said motor includes a shaft, centers of said spindle and said shaft are substantially aligned, said centers being substantially co-planar with centers of said lastcarrier.

4. A combined heel, forepart and cement-lasting machine accordingto claim 3, wherein a cut-out switch is associated with said motor driving said spindle, a tripping blade is disposed between said heel-band and a last disposed on said last-carrier, said tripping blade actuates said cut-out switch.

5. A combined heel, forepart and cement-lasting machine according to claim 4, wherein means adjustably mount said tripping blade and said cut-out switch on said heel-band.

6. A combined heel, forepart and cement-lasting machine according to claim 1, wherein said last-carrier is pivotably supported in said machine frame.

7. A combined heel, forepart and cement-lasting machine according to claim 6, wherein a cut-out switch is associated with said motor, a tripping blade is disposed between said heel-band and a last disposed on said last-carrier, said tripping blade actuates said cut-out switch.

8. A combined heel, forepart and cement-lasting machine according to claim 1, wherein said motor includes a shaft, said spindle drive means includes a spindle, centers of said spindle and said shaft are substantially aligned, said centers being substantially co-planar with center of said last-carrier.

9. A combined heel, forepart and cement-lasting machine according to claim 1, wherein a cut-out switch is associated with said motor, a tripping blade is disposed between said heel-band and a last disposed on said last-carrier, said tripping blade actuates said cut-out switch.

10. A combined heel, forepart and cement-lasting machine according to claim 9, wherein means adjustably mount said tripping blade and said cut-out switch on said heel-band. 

1. A combined heel, forepart and cement-lasting machine comprising a machine frame, a heel-band supported in said machine frame, a last-carrier, motor means for displacing said lastcarrier towards said heel-band, said motor means including a rotary motor, and self-locking spindle drive means coacting with said rotary motor for both moving and stopping said last-carrier to provide a precise position thereof during a working cycle, said self-locking spindle drive means including threaded members operatively associated with one another for both moving said last-carrier when said rotary motor is operating and locking said last-carrier against movement when operation of said motor is terminated.
 2. A combined heel, forepart and cement-lasting machine according to claim 1, wherein said rotary motor drives a spindle of said spindle drive means, said rotary motor being a hydraulic motor.
 3. A combined heel, forepart and cement-lasting machine according to claim 2, wherein said motor includes a shaft, centers of said spindle and said shaft are substantially aligned, said centers being substantially co-planar with centers of said last-carrier.
 4. A combined heel, forepart and cement-lasting machine according to claim 3, wherein a cut-out switch is associated with said motor driving said spindle, a tripping blade is disposed between said heel-band and a last disposed on said last-carrier, said tripping blade actuates said cut-out switch.
 5. A combined heel, forepart and cement-lasting machine according to claim 4, wherein means adjustably mount said tripping blade and said cut-out switch on said heel-band.
 6. A combined heel, forepart and cement-lasting machine according to claim 1, wherein said last-carrier is pivotably supported in said machine frame.
 7. A combined heel, forepart and cement-lasting machine according to claim 6, wherein a cut-out switch is associated with said motor, a tripping blade is disposed between said heel-band and a last disposed on said last-carrier, said tripping blade actuates said cut-out switch.
 8. A combined heel, forepart and cement-lasting machine according to claim 1, wherein said motor includes a shaft, said spindle drive means includes a spindle, centers of said spindle and said shaft are substantially aligned, said centers being substantially co-planar with center of said last-carrier.
 9. A combined heel, forepart and cement-lasting machine according to cLaim 1, wherein a cut-out switch is associated with said motor, a tripping blade is disposed between said heel-band and a last disposed on said last-carrier, said tripping blade actuates said cut-out switch.
 10. A combined heel, forepart and cement-lasting machine according to claim 9, wherein means adjustably mount said tripping blade and said cut-out switch on said heel-band. 